Resolution Audio Opus 21 stack including the CD Player, Power Centre, Extra Sources and S30 power amplifier. The CD Player and Power Centre units were upgraded to Statement status by Great Northern Sound and Steve Huntley who became head of production at Resolution Audio. See specifications here for Opus 21 CD Player and Power Centre: http://www.resolutionaudio.com/manuals/21cd_manual.pdf The Extra Sources ("XS" for short) facilitates moving coil and moving magnet phono inputs, analog input, tuner (AM and FM), line level output both variable and fixed and headphone out. See specifications here: http://www.resolutionaudio.com/manuals/21xs_manual.pdf The S30 amplifier is a 30 watt per channel amp. See specifications here: http://www.resolutionaudio.com/manuals/21s30_manual.pdf Both the XS and S30 must be used in conjunction with the CD Player and Power Centre units; the XS and S30 cannot be used separately apart from the CD Player and Power Centrey units. I will only sell these as a full set and will not sell the CD Player and Power Centre, XS or S30 separately. Comes in with original packaging which consists of very stout wooden shipping crates. Also includes remote control and owner's manuals. Also includes molded power cords and cabling between CD Player, Power Centre, XS and S30. Does not include speaker cables or other interconnects pictured. Sell to lower 48 states of the United States only.